Well to be perfectly honest I never used the default TClientDataset/ TDataSource etc(at least not since the 90')...they are slow and buggy components. If you want somthing performant try IBOObjects, Zeos(I do not you your database server).

But If it is a known bug, so why never fixed it.
This is not a only bug, are many, transparency on labels, sometimes (sometimes) lose fields. I click on the form he clicks a button, missing image of buttons, and so on.

But If it is a known bug, so why never fixed it.
This is not a only bug, are many, transparency on labels, sometimes (sometimes) lose fields. I click on the form he clicks a button, missing image of buttons, and so on.